Carbureter.



I. V. MITCHELL.

GARBURETER. v

APPLICATION FILED FEB. 10. 1915.

Patented ar. 12, 1918.

ISG METHELL, @E LGS ANGELES, Calllhs @Manassas Specification o'letters Eatent.

loaten'ted lllaiz il?, lll.

Application led February l0, 1915. Serial No. i293.

To all whom t may concern:

Be it Aknown that, I, lsAAc VAN Mimi-mun,

a citizen of the United States, residing in internal combustion motors, and it has forits object to provide an improved carburetor which will be generally superior in point ofA relative simplicity and inexpensiveness of construction and organization, taken in connection with adaptability to varying conditions of use and service, eliectiveness in operation, facility in control and durability and which will be generally superior under a Wide range of varying working conditions..

The invention consists in the novel and useful'formation7 construction, combination, association and relative arrangement of parts, members and features9 as hereinafter described, shown in the drawingand finally pointed out in claims.

In the drawing:

Figure l is a central, vertical, sectional view of an improved carburetor, organized to embody the invention, same being shown as applied to the manifold or fuel intake pipe of the motor; parts being broken away and parts shown in elevation for fullness of illustration.

Fig. 2 is a side elevation of the carbureterlooking in the direction of the arrow Fig 2 in Fig. l, parts being likewise broken away for fullness of illustration;

Fig. 3 is a detail transverse sectional. view taken upon the line XBMX, Fig. l, and looking in the direction of the arrow Figa 3, Fig. l, and

Fig. l is aN fragmentary plan view of a portion of the showing in Fig. l..

Corresponding parts of all the figures are designated by the same reference characters.

Referring with iarticularity to the drawing, the improve carburetor therein disclosed is shown in Fig. l as applied to one end of the manifold intake pipe A for supply of fuel to the motor, the carburetor' and the manifold pipe being provided with matched flanges 5 and 'tl/suitably bolted to :Weiher as at 7", so`that the carbureter may feed directly ipe, under regulation the top of aule or vand d, which converge atthe mixture che connected a crank` arm 9 whereby the throttlc valve may be controlled manually or otherwise.

The carbureter in the main comprises a liquid or hydrocarbon fuel chamber a at the lower portion of the carburetor, above which is provided a mixture chamber b there being provided two converging air inlet passages c .ber i), said passages c and nl arranged obliquely upwardly over the top of the fuel chamber a. e desi nates a valve controlling the admission of Jair through the passage o, such passage being an auxiliary air passage u hereas the passage Z constitutes the main air passage and likewise constitutes the passage whereby the mixture of air and vaporized fluid proceeds to the mixture chamber b.

designates means of operative connection etween the throttle valve 7 and the auXillary air passage valve e; whereby as the throttle valve is operated the valve e is operated to any extent as predetermined by 4means of adjustable c onnections g incorporated in the means and operative connection.

7. h designates an adjustable fuel spray nozzle whereby liquid fuel taken from the fuel chamber a; is inducted to the feed passage ai, the adjustable nature of the same permitting the amount of such liquid fuel admission to be predetermined. /c designates a liquid fuel feed pipe supplying liquid 'fuel to the fuel chamber a at the bottom of the same through a duct l0 controlled by a needle valve ll, such needle valve being' Qcoiurolled as to its position as by a float lil and operative connections l between the float and the stern of the needle valve7 all in accordance with standard er any preferred practice.

ln the formation and construction shown in the drawing, the needle valve is hou'd in a tubular bolt 13 fast to the base cap of the carbureter and the fuel chamber a thereof, and threaded into the crown l5 thereof as at 16 such bolt being laterally perforated or slotted' as at l? to permit inflow of liquid fuel 1troni the interior of the hollow bolt to the fuel chamben Bill The operative connections Il are shown consisting of intermediate pivoted ngeis ll'a mounted between lugs i8 projecting from an. adjustable ring or b Shing threaded upon the bolt 3; said lingers if@ 0 m groove lila in tno .h .a f a upper ci the tneir inner ends taking onto a c" Coniferstem of the needle valve il.y The fingers 17a are enlarged at their upper ends so as to follow the fall of the float 12, and to be immediately responsive to rise of the latter, also lifting the needle valve as the float falls, thus permitting an increased flow of liquid fuel through the duct l0 through the fuel chamber ce. rEhe threaded connection of the ring 19 with the bolt 13 permits the normal position or elevation of the lingers 171 to be varied, thus varying the level of the liquid fuel within the chamber c with respect to the cut ed point of the duct l0; all to the end that a proper level of liquid fuel may be maintained within the chamber a and consequently properly supply the adjust able spray nozzle device 7g. The device h comprises, as shown, a hollow screw 2O threaded into the enlarged side wall of the chamber a, and carrying a nozzle body 22 which is provided with an enlarged end or hub 22a surrounding the shank of the screw 20 immediately beneath the head 22b thereof, such nozzle resting against the bottom wall of the air passage d and being adjustable thereon as to variation and inclination; said nozzle bein provided with a plurality of upwardly which fuel from the fuel chamber a is transmitted in the form of spray into the passage d, therein to be mixed with air and carried upwardly to themjxture chamber The/"tubular screw 20 is provided with a port 22d communicating with the hub or enlargement 22 of the nozzle 22, thus establishing communication between the latter and the tubular screw and the fuel chamber a. A portion of the wall of the passage al is severed to constitute a detachable cap 23 held to the passage structure by screws 24:, and permitting, upon removal, the introduction of a screw driver or other suitable implement within the passage al for manipulation of the screw head 22b and the adjustment of the nozzle 22. When the screw 20 is home the nozzle 22 is held in position of adjustment.

rlhe valve e is mounted upon a shaft or axle 25 bridging the auxiliary air 'passage c, adjacent to the intake end thereof and an arm 26 fast to said shaft 25 carries a threaded adjusting screw 27 upon which is mounted a follower or threaded block 28 from which extends a link 29 which is pivotally connected therewith and with an arm 30 fixed to the shaft or axle 8 of the throttle valve 7. The arm 26 and these connections are exterior to the air passage c, and the adjusting screw 27 is provided with a dagen ing feature 30 whereby the follower 28 may be adjusted to cause the same to travel to and 'from the axis of the shaft 25, to the end that said shaft may be rocked to a greater or lesser degree responsive to a certain oscillation of the shaft 8 and the throttle valve irected ducts 22 through' sage c to impoverish netsnoer 7, all to the end that a greater or lesser responsive movement of the valve c may ensue and a greater or lesser amount of air be admitted to the mixture chamber 2') through the auxiliary air passage c. rihe normal position of the valve c may be determined and maintained by swinging the shaft 25 with the valve in the bearings of the shaft, and then fixing the position of same by means of a set screw 3l applied to such shaft and 7 mminted in the inner end of the arm 2G. The adjustable connections g thus permitting control of he swing of the valve e and the set screw 3l permits the normal position of the valve e to be varied. l

rihe operation, method of use and advantages of the improved carbureter constituting the invention will be readily understood from the foregoing description taken in connection with the accompanying drawing and the following statement:

Fuel from the chamber a is jetted into the passage Z through the perforated nozzle y 22 due to the partial vacuum formed in the passage Z by engine suction, the flow-of such fluid being dependent upon the inclination of the nozzle 22 under adjustment permitted by adjustment of the screw 20. The fuel thus drawn into the passage d .volatilizes and mixes with the air in that passage and the mixture proceeds to the mixture chamber whence it is drawn past the throttle valve Z into 'the manifold. An auxiliary supply of air is furnished through the pasthe mixture in the chamber subject to control by the valve c which is responsive to the movement of the throttle valve 7. The adjustment of the nozzle 22 is made to provide the proper feed of fuel in accordance with the demands of the motors. This nozzle is-held substantially at the level of the liquid fuel in the chamber a and is adjusted relative to such level.

`The provision of a plurality of orifices 22c through which the fuel is jetted into the passage Z insures a zgood'distribution of the liquid fuel throughout the incoming air, as well as increasing the range of adjustment of proportions of fuel to air when adjustment of the nozzle from the horizontal is made. i

These satisfactory features of the carburetor permit of producing exactly the proper mixture of the -\proper richness for supplying the needs of the motor and the needs of such motor vary; the entire voluntary control being effected through the throttle valve. R

Having thus disclosed my invention, l claim and desire to secure by Letters Patent: l. ln a carburetor, a fuel chamber, an air passage, and a fuel nozzle'in the air passage and communicating with the fuel chamber; said fuel nozzle being adjustably 1 ently of any throttle valve or engine movement.

2. A earbureterv having a fuel chamber, and an inc-.lined zur passage, a fuel nozzle 1n the alr passage and communlcatm wlth the.

fuel chamber; said fuel nozzle eing ad- .justahly pivotally mounted whereby the feed of fuel therethrough may be varied independently' of any throttle valve or engine movement and in predetermined amount; said fuel nozzle having a. plurality of orifices through which liquid fuel may be jetted into the air passage.

In testimony whereolf,v have signed my nlne'to this specifioation .in the presence of the two subscribing witnesses.

ISAAC VAN MITCHELL.

Witnesses:

ALFRED H. DAEHLER,' '15mm FULLEN. 

